Attempting to perform an upgrade from Leap-15.5 to Leap-15.6; the upgrade mechanism has been used successfully for at least the last 2 Leap upgrades; what I did is as follows:
Downloaded openSUSE-Leap-15.6-DVD-x86_64-Media.iso; all the image integrity checks passed (sha256 and signature);
ISO image written to DVD using k3b; image verified OK;
Changed the boot order in the EFI BIOS to boot from DVD installation media;
Successfully booted from installation media and selected the upgrade path;
The upgrade gets as far as the “Installation Settings” screen, where I get the following error message: “Cannot upgrade the bootloader because of a mismatch of the boot technology. The upgrade system uses EFI boot while the installation medium has been booted using legacy BIOS boot. This scenario is not supported, the upgraded system may not boot or the upgrade process can fail later. ERROR: No proposal” Never had this message before on previous upgrades; the existing Leap-15.5 is definitely set-up for EFI boot and GPT partition set-up.
Not sure what to do apart from a full installation; has anybody else seen this error?
Note I have used the same upgrade process in the past without problem. I can either enter the EFI BIOS directly (F2/del during post), or I can select the EFI setting option from the GRUB menu which reboots into the EFI BIOS, i.e. the same as the former. In the EFI BIOS I can select the boot device.
hui, I am getting the legacy mode boot screen; how did you get to the UEFI boot screen?
One way is to go into BIOS setup and disable CSM (legacy/MBR) booting, by whatever name your BIOS uses. Your BIOS BBS hotkey boot menu is another option, with CSM enabled, usually offering two or more copies of each bootable device to choose from, where the prudent choice usually is a UEFI-labeled one. If your .iso has been written to Ventoy instead of directly, you may find what you want is thwarted and you need to re-write it directly to a USB device (not partition).